package listtest;

import java.util.Arrays;

public class MyArrayList implements IList{
    public int[] array;
    public int useSize;
    public static final int DEAULT_CAPACITY = 10;

    public MyArrayList(){
        this.array = new int[DEAULT_CAPACITY];
    }

    @Override
    public void add(int data) {
        if(isFull()){
            grow();
        }
        this.array[this.useSize] = data;
        this.useSize++;
    }

    public boolean isFull(){
        return this.useSize == array.length;
    }

    private void grow(){
        this.array = Arrays.copyOf(this.array,
                2*this.array.length);
    }


    private void checkPos(int pos) throws PosIllegal{//告诉会抛出一个异常
        if(pos < 0 || pos > this.useSize){
            throw new PosIllegal("Pos位置不合法！！！");
        }
    }
    @Override
    public void add(int pos, int data) {
        try {
            checkPos(pos);

        }catch (PosIllegal e){
            System.out.println("插入元素pos位置不合法");
            e.printStackTrace();
        }


        if(isFull()){
            grow();
        }

        //挪动元素
        for (int i = useSize - 1; i >= pos; i--) {
            this.array[i+1] = this.array[i];
        }

        array[pos] = data;
        useSize++;

    }


    @Override
    public boolean contains(int toFind) {
        for (int i = 0; i < array.length; i++) {
            if(array[i] == toFind){
                return true;
            }
        }
        return false;
    }

    @Override
    public int indexOf(int toFind) {
        for (int i = 0; i < array.length; i++) {
            if(array[i] == toFind){
                return i;
            }
        }
        return 0;
    }


    private void checkPos2(int pos) throws PosIllegal{//告诉会抛出一个异常
        if(pos < 0 || pos >= this.useSize){
            throw new PosIllegal("Pos位置不合法！！！");
        }
    }

    public boolean isEmpty(){
        return useSize == 0;
    }
    @Override
    public int get(int pos) {

        try {
            checkEmpty();
            checkPos2(pos);
            return array[pos];
        }catch (PosIllegal e){
            e.printStackTrace();
        }catch (EmptyException e){
            e.printStackTrace();
        }
        return -1;
    }

    private void checkEmpty(){
        if(isEmpty()){
            throw new EmptyException("顺序表为空!!!");
        }
    }

    @Override
    public void set(int pos, int value) {
        try {
            checkEmpty();
            checkPos2(pos);
            array[pos] = value;
        }catch (PosIllegal e){
            e.printStackTrace();
        }catch (EmptyException e){
            e.printStackTrace();
        }
    }

    @Override
    public void remove(int toRemove) {
        try {
            checkEmpty();
            int pos = indexOf(toRemove);
            if(pos == -1){
                return;
            }
            for (int i = pos; i < useSize - 1; i++) {
                array[i] = array[i + 1];
            }
            useSize--;
        }catch (EmptyException e){
            e.printStackTrace();
        }
    }


    @Override
    public int size() {
        return this.useSize;
    }

    @Override
    public void clear() {
        //引用类型
       /* for (int i = 0; i < useSize ; i++) {
            array[i] = null;
        }*/
        useSize = 0;
    }

    @Override
    public void display() {
        for (int i = 0; i < this.useSize; i++) {
            System.out.print(array[i] + " ");
        }
    }
}
